Katy Perry and John Mayer have reportedly ended their relationship. According to E! News, a source revealed that Katy broke it off with John “within the last few days.” The couple began dating in the summer of 2012, split for a while and reconciled again. News of this split comes just a few days after engagement rumors sparked when Katy was seen sporting a large diamond ring on her left hand. Katy and John have been one of the hottest couples in Hollywood and even collaborated for the duet, Who You Love. Katy previously said she was thrilled to collaborate with John, adding, “I’ve been a fan of John’s for years before I got to actually kiss him. I’ve been such a fan, I think he’s so incredibly talented and gifted and a genius songwriter. So to be a part of anything he was doing was just natural.” John was not seen during Katy’s recent trip to London, where she performed at the BRIT Awards.